scholarly journals The structural, magnetic, hydrogenation and electrode properties of REMg2Cu9−xNix alloys (RE=La, Pr,Tb)

2011 ◽  
Vol 9 (6) ◽  
pp. 1133-1142 ◽  
Author(s):  
Volodymyr Pavlyuk ◽  
Ewa Rozycka-Sokolowska ◽  
Bernard Marciniak ◽  
Valerie Paul-Boncour ◽  
Maria Dorogova
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
High Temperature ◽  
Hydrogen Absorption ◽  
Ternary Alloys ◽  
Magnetic Contribution ◽  
Hydrogen Storage Properties ◽  
Effective Moment ◽  
Ni Substitution ◽  
Storage Properties

AbstractThe LaMg2Cu9, PrMg2Cu9, LaMg2Cu4Ni5, PrMg2Cu4Ni5 and TbMg2Cu6Ni3 alloys were prepared for the investigations of crystal structure, magnetic and hydrogen storage properties. The magnetic properties of several REMg2Cu9−xNix compounds have been studied up to 9 T and from 2 to 300 K. Tb compounds show a ferrimagnetic (with Ni) or antiferromagnetic (without Ni) behaviour, which can be attributed to the Tb magnetic structure. At high temperature a paramagnetic Curie Weiss behaviour is observed and the effective moment corresponds to that of Tb. A magnetic contribution of Pr moment is observed in both Pr compounds, with larger magnetization for PrMg2Cu4Ni5 and a transition at 3 K. The hydrogen absorption occurs at 95 bar for LaMg2Cu9 (3 H f.u.−1) and above 2 bars for LaMg2Cu4Ni5 (1.6 H f.u.−1). The effect of Cu-Ni substitution on the electrochemical properties of LaMg2M9 ternary alloys was investigated leading to maximum discharge capacity of 250–310 mAh g−1.

The Effect of Initial Activation on Microstructures of Mg/Cu Super-laminates and Hydrogen Absorption Properties

2007 ◽  
Vol 1042 ◽  
Author(s):  
Koji Tanaka ◽  
Nobuhiko Takeichi ◽  
Hideaki Tanaka ◽  
Nobuhiro Kuriyama ◽  
Tamotsu T Ueda ◽  
...  
Keyword(s):  
Hydrogen Absorption ◽  
Diffusion Distance ◽  
Absorption Properties ◽  
Hydrogen Storage Properties ◽  
Fine Grain ◽  
Nano Structures ◽  
Initial Activation ◽  
Micrometer Size ◽  
Storage Properties ◽  
Short Diffusion Distance

AbstractMicrostructures and hydrogen storage properties of Mg/Cu super-laminates were compared to clarify the effect of initial activation. The initial activation change micro/nano-structures of Mg/Cu super-laminates into Mg2Cu with layered structure in fine grain size of about 1μm and pores highly dispersed between layers in sub-micrometer size. Large surface area, dense defects and short diffusion distance for the reaction enable Mg/Cu super-laminates to absorb hydrogen very quickly.

High-Temperature and High-Pressure Aqueous Solution Formation, Growth, Crystal Structure, and Magnetic Properties of BiFeO3Nanocrystals

2011 ◽  
Vol 23 (5) ◽  
pp. 1158-1165 ◽  
Author(s):  
Jian-Li Mi ◽  
Thomas N. Jensen ◽  
Mogens Christensen ◽  
Christoffer Tyrsted ◽  
Jens E. Jørgensen ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
High Pressure ◽  
Magnetic Properties ◽  
High Temperature ◽  
Solution Formation

scholarly journals Preparation of Mg2FeH6Nanoparticles for Hydrogen Storage Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
N. A. Niaz ◽  
I. Ahmad ◽  
N. R. Khalid ◽  
E. Ahmed ◽  
S. M. Abbas ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Absorption ◽  
Hydrogen Pressure ◽  
Absorption Rate ◽  
Desorption Kinetics ◽  
Prepared Compound ◽  
Hydrogen Storage Properties ◽  
Storage Properties ◽  
Effective Hydrogen ◽  
Type Apparatus

Magnesium (Mg) and iron (Fe) nanoparticles are prepared by thermal decomposition of bipyridyl complexes of metals. These prepared Mg-Fe (2 : 1) nanoparticles are hydrogenated under 4 MPa hydrogen pressure and 673 K for 48 hours to achieve Mg2FeH6. Their structural analysis was assessed by applying manifold techniques. The hydrogen storage properties of prepared compound were measured by Sieverts type apparatus. The desorption kinetics were measured by high pressure thermal desorption spectrometer (HP-TDS). More than 5 wt% hydrogen released was obtained by the Mg2FeH6within 5 min, and during rehydrogenation very effective hydrogen absorption rate was observed by the compound.

Impact of hydrogen absorption on crystal structure and magnetic properties of geometrically frustrated Nd2Ni2In

2013 ◽  
Vol 566 ◽  
pp. 22-30 ◽  
Author(s):  
S. Mašková ◽  
L. Havela ◽  
S. Daniš ◽  
A. Llobet ◽  
H. Nakotte ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Hydrogen Absorption ◽  
Geometrically Frustrated
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